90217919 has 8 divisors (see below), whose sum is σ = 98515920. Its totient is φ = 81936000.

The previous prime is 90217889. The next prime is 90217931. The reversal of 90217919 is 91971209.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90217919 is a prime.

It is a super-2 number, since 2×90217919² = 16278545817381122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90217949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9797 + ... + 16625.

It is an arithmetic number, because the mean of its divisors is an integer number (12314490).

Almost surely, 2^90217919 is an apocalyptic number.

90217919 is a deficient number, since it is larger than the sum of its proper divisors (8298001).

90217919 is a wasteful number, since it uses less digits than its factorization.

90217919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8041.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 90217919 is about 9498.3113762395. The cubic root of 90217919 is about 448.5018806157.

The spelling of 90217919 in words is "ninety million, two hundred seventeen thousand, nine hundred nineteen".